Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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This invention relates generally to a walkway, and particularly to
an articulating marine walkway, or gangway, designed to be stored in elevated
position and capable of being properly positioned by one man so as to allow
for variance in the position of a vessel vertically and horizontally within
prescribed limits with respect to a fixed point of mounting of the gangway,
; all the while providing for safe access between a vessel and an adjacent dock
or pier.
It is an object of the present invention to provide a marine walkway
which compensates for variance in vessel location both vertically and hori-
zontally automatically without the need of manual corrections.
It is another object of the present invention to provide a walkway
which, once installed, can be operated without the need of tools, the ramp
being merely lowered by means of a winch.
Yet another object of the present invention is to provide a marine
walkway which, when resting on a vessel, is not dependent on cables for sup-
port, the cables being used only for raising and lowering and storing the
gangway in an upright position.
It is yet another object of the present invention to provide a marine
walkway, or gangway, which includes cables fitted with a sliding weight and
pulley arrangement which take up slack in the cable.
SUMMARY_OF THE INVENTION
These and other objects are achieved according to one aspect of the
present invention by providing a walkway having: an elongated member forming
a passageway; a base connected to the elongated member for pivotally supporting
the elongated member for movement about a substantially horizontal axis and
permitting the member to swing in a substantially vertical path; and a
position control system connected to the elongated member for controlling
swinging movement of the member.
A further aspect of the present invention provides a method for
controlling the position of a longitudinally extending member having
longitudinally spaced ends and pivoted at one of the ends for swinging
movement about a horizontal axis, comprising the stepsof: attaching one end
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of a length of cable to the member at a point on the member spaced from
the horizontal axis, and to a winch; and biasing the cable intermediate
of the member and winch for retaining the cable taut regardless of the
position of the member about the horizontal axis, while simultaneously
permitting the member to pull cable against the bias,
GENERAL DESCRIPTION OF THE INVENTION
The base of the walkway preferably includes a pivot support forming
the horiæontal pivot axis of the elongated member, with the pivot support
itself being mounted for pivotal movement about a substantially vertical
axis for slewing the elongated member. The base also advantageously includes
a tower arranged extending upwardly from adjacent the pivot support for
supporting in part the position control system. The elongated member itself
extends
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longitudinally and has a pair of spaced end~, with one of the end~ being
pivotally attached to the support means of the base, and the position control
system bein8 connected to the other of the ends of the member for selectively
pulling the member in a vertical path toward a substantially vertical storage
position.
The position control sy6tem preferably includes a weight supported
on the tower of the base by a cable connected at longitudinally spaced ends
thereof to the free end of the elongated member and to the winch, with the
weight being supported by the cable between the member ant winch. The purpose
of the weight is to take up slack in the cable with a force substantially less
th~n the mass of the elongated member, with the winch being arranged for
swinging the member upwardly against the mass thereof and holding the me~ber
in the aforementioned stored posltion.
The walkw~y further includes an element pivotally attached to the
other of the ends of the elongated member for pivotal vement about an axis
spaced from but ~ubstantially parallel to the pivot axis of the member relao
tive to the pivot support of the base. This element i~ arrangeable abutting
a support with which the walkway engages when in an operati~e position. In
particular, it is contemplated that this support will be the deck of a ship
sub~ect to movement by tides, waves, wind, and the like, in which case the
pivotally mounted el~ment permits the walkway to remain in engagement with the
deck of the ship regardless of its height or pi~ch, with the slack take-up
feature of the po~ition control system of the walkway permitting the wslkway
to ve up and down as necessary without use of the winch.
~ stop can be provided on one of the walkway member and element for
limiting pivotal vement of the element relative to the member to a downward
swing only, while wheels or rollers are advantageously provided on the walkway
for facilitating ad~ustment of the walkway relative to a changed position of
the support. That is, the support may move toward and away from the base of
the walkway, thus making the rolling friction afforded by wheels or rollers of
8reat benefit.
Figure 1 is a schematic, side elevational view showing the basic lay-
out of a walkway according to the invention, and several of the numerous posi-
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tion5 the walkway can assume.
Figure 2 is a top plan view of the structure as seen in Fig. 1.
Figure 3 is an enlarged, fragmentary, ~chematic, top plan viewshowing the pivotal mounting of the walkway inner member on a base of the
walkway.
Figure 4 i8 a fragmentary, ~ectional view taken generally along the
line 4--4 of Fig. 3.
Figure 5 is an enlarged, fragmentary, side elevational view showing
the ramp portion of the structure of Fig. 1 in greater detail.
Figure 6 i5 an enlarged, fragmentary, sectional view taken generally
along the line S--6 of Fig. 5.
Figure 7 is an enlarged, section21 view taken gener~lly along the
line 7--7 of Fig. 5, but with some parts re ved.
Figure 8 is an enlarged, fragmentary, sectional view taken generally
along the line 8--8 of Fig. t.
Figure 9 is an enlarged, fragmentary, side elevational view showing
in detail ~he upper right, center portion of Fig. 5.
Figure 10 i8 an enlarged, frag~entary, side elevational view, partly
broken away and in section, showing in tetail the lower right center portion
of Fig. 5, but w~th the outer walkway element in a changed position.
~ igure 11 i8 a fragmentary, perspective view showing the axle unt-
ing for the wheels of the ramp portion of the walkway.
Referring now more particularly to Figs. 1 snd 2 of the dr~wing~, a
walkwsy 10 according to the present invention includes an elongated me~ber 12
forming a passageway and pivotally supported by a base 14 in such a manner
that member 12 can pi~ot about a r9ubstantially horizontal AXi8 a-a and is
permi~ted to swing in a substantially vertical path. A position control system
16 is connected to the member 12 fcr controlling swinging vement of walkway
10, while member 12 pivotally attached to the outer end thereof, that being
the end spaced from axi3 a~a9 an element 18 arranged for pivotal vement
about an axis b-b disposed substantially parallel to axis a-a. Thi~ ~lement
18 is arranged for abutting a support s~ such as the deck of a ship. Ba~e 14
includes a tower 20 arranged extending upwardly for supporting in part the
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position control system 16, which system 16 permits the member 12, and accord-
ingly element 18, to sdjust to ~arious heights ant distances of support S
relative to a dock D, and the like, on which walkway 10 is unted, as indi-
cated by the broken line showings of member 12 in Fig. 1.
Position control system 16 includes a cable 22 arranged extendlng
; over a pulley assembly 24 and between a conventional winch 26 a~d the outer end
of member 12. A suitable weight 28 provided with a conventional sheave 30 RO
as to be suspended from cable 22 between a pair of conventional pulleys forming
- pulley assembly 24. By this arrangement, it can be appreciated that the down-
~ 10 ward pull of weight 28 will assure cable 22 remaining in a taut condition
- regardleæs of the position of member 12, and cable 22 will be retained in this
taut condition without actuation of winch 26. Thus, winch 26 need only be em-
ployed to raise member 12 upw~rdly into a storage position (not shown) a~d to
lower member 12 downwardly into an operative position, as desired. Once
lowered into operative position, member 12, and accordingly elament 18, can
move together with the support S with cable 22 remaining taut without addi-
tional use of wlnch 26. Member 12 is supported by support S once member 12 i8
lowered into the operative position thereof.
Rollers or wheels 32, 32' are provided on the waLkway, preferably
as illustrated on member 12 adjacent the outer end thereof and at the terminal
end of element 18, wLth these wheels 32J 32' being arranged for engaging sup-
port S and permitting adjustment of member 12 and element 18 relative to a
changed position of support S, as can be sppreciated by the several positions
of the walkway seen in Fig. 1.
~eferring now more particularly to Figs. 3 and 4 of the drawings in
addition to Figs. 1 and 2, base 14 includes a pivot support 34 forming the
horizontal pivot axis a~a for member 12 and itself mounted for pivotal move-
m~nt about a substantially vertical axis for slewing the member 12. Kore
specifically, pivot support 34 is journsled on a shaft 36 extending vertically
30 from a platform 38 partially forming base 14 and rece~vet in a sleeve 40 af-
fixed to piv~t support 34. Axis a-a itself is formad as by a rod 42 journaled
inlrusses 44, 44' of pivot support 34 and rotatably journaled in a slee~e 46
affixed to the ad~acen~ end of member 12.
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As can be seen from Figs. 5 through 11 of the drawings, in con~unc-
tion with Figs. 1 through 4, member 12 and element 18 are provided with suit-
able handrails 48 and 48', respectively. Each of member 12 and element 18
themselves is constructed in a si~ilar manner by side rail~ separated by a
plurality of substantially parallel, longitudinally spaced upper and lower
sleeves 50 and 50' retained as by suitable friction clampæ 52, 52' to side
plates 54, 54' and unted on upper and lower I-beam~ 56, 56' and 58, 58'
which form the side ra~ls. Z-bars 60 are used to connect flooring 62 to the
upper sleeves 50, while angle cleats 64 are spaced along tha upper surface of
10 flooring 62 along the longitudinal extent of member 12 and element 18. ~and^
rails 48 and 48' are supported on the side rails of member 12 and element 18,
respectively, by stanchions 66, 66' which receive posts 68 and 68'.
AdJacent ends of handrails 48 and 48' are provided with legs 70 and
70' extending substantially perpendicularly to the plane of the associated
me~ber 12, 18, and connected to the re~t of the associated hsndrail structure
by upper rails 72, 72' and lower rails 74 and 74' substantially parallel to
the upper rails. Suitable safety chains 76 and 76' are advantageously unted
on legs 70, 70' by means of ~uitable fittings, in order to help li~1t the
downward swing of element 18 with respect ~o me~ber 12.
Element 18 is pivotally unted on member 12 as by a threadet rod 78
secured to the ou~er end of member 12 and received in the opposed side rails
of element 18. As can be seen from Fig. 10, a sleeve 80 extending between side
plates 82 at the outer end of member 12 help~ form a stop in the downward
direction for element 18 relative to member 12. This sleeve 80 is similar to
the upper sleeves 50 otherwise disposed throughout the length of member 12.
As can be appreciated, the unting of element 18 on ~e~ber 12 as seen in Fig.
10 will result in el~ent 18 being stopped from upward movement relative to
member 12 80 as to achieve the 6traight relationship of the member 12 and
element 18 as seen in full lines in Fig. 1, due to the flush engagement of
30 flooring 62, 62' and the upper I-beams 56, 56'.
Wheels 32, 32' are advantageously mounted on the underside of the
members 12, 18 as by an arrangement best seen in Fig. 11 and including 8 pair
of spsced, substRntially parallel, coextensive angle beams 34 and 84' having
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affixed between same a sleeve 86 which journals a shaft 88 on which wheels 32,
32' may be mounted in a suitable manner.
As can be readily understood from the above description ant from the
drawings, a walkway sccording to the present invention will, once lowered into
operative position, automatically correct to variances in the location of 8Up-
port S both vertically and horizontally without the need of ~anual corrections.
~hen the ramp formed by mæmber 12 and element 18 is resting on support S, the
ramp is not dependent on cables 22 to support. The cables 22 are used only
for raising and lowering and storing the ramp in the upright posit~on (not
shown).
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